Grinding mills



Dec. 22, 1964 F. DE LOS SANTOS IZQUIERDO ETAL 3,162,383

Filed April 5, 1962 GRINDING MILLS 3 Sheets-Sheet 2 \NVENTORS FEDERICO DE LOS SANTOS lZQUlERDO 1 RAFAEL. bmz GOMEZ Y 1W am M ATTORNEYS 1964 F. DE LOS SANTOS IZQUIERDO ETAL 3, 6

GRINDING MILLS Filed April 5, 1962 3 Sheets- -Sheet 3 INVENTORS FEDERKZO DE LOS SANTOS IZQU\ERDO RAFAEL om; GOMEZ ATTORNEYS United States Patent 62,295 Claims. (Cl. 241-64) The present invention is related to grinding mills and more particularly to certain types of mills which characteristics are hereinafter described.

The main characteristic is that the grinding member is stationary and the material to be ground is rapidly rotating, striking with violence against said stationary member.

The details of the invention, and further characteristics and advantages thereof, will be more clearly apparent in the course of the present specification and accompanying drawings which are given as an illustration thereof, and which drawings carry similar reference character to designate like parts in the various views.

In the drawings:

FIGURE 1 is a front view of the assembly.

FIGURE 2 is a front view with portions removed.

FIGURE 3 is a profile sectional view taken along line 33.

FIGURE 4 is a profile view of a modified embodiment with portions removed.

Before fully describing the invention, we wish it to be understood that the accompanying drawings depict the invention only as an illustrative embodiment thereof, and that the same is not limited to the details shown in the drawings, variations and modifications being resorted to in practice, without any other restriction such as indicated in the accompanying claims appearing at the end of the present specification.

Referring to the drawings, the present invent-ion is comprised of a mill outer body indicated by number 1, having a cylindrical form such as shown in the drawings. Said tubular body is closed by two caps designed 2 and 3. Said caps 2 and 3 are fastened to the cylinder by fastener screws 4. To the caps are secured pulleys 5 and 6 equipped with V-band grooves for reception of drive belts. The pulleys rotate on roll bearings or journals 7, which bear and mount the fixed transverse spindle 8.

Spindle 8 is hollow and has an opening in the form of a Window at the inner portion of the mill and facing downwards, such as indicated by means of arrow A.

This opening serves as an inlet for the material to be ground in the mill.

Spindle 8 has at one end a bin 9 in the form of a funnel which serves as an inlet for the material.

At the other end of spindle 8 there is a turbine fan or extractor which sucks out the ground material. Said extractor is designated by reference number 10 (FIG- URE 1).

At the bottom of said extractor and connected to the outlet an articulated tube or pipe 11 is provided.

The extractor has a drive pulley 12.

The fixed spindle or tube 8 has member 13 strongly fastened thereto, said member 13 at one end wiping the inner part of the mill and being formed either with an arcuate profile or a straight profile as shown in FIGURE 4 of the drawings.

Member 13 is fixed to the tube or spindle 8 by means of screws 14.

The grinding mill works as follows:

A motor (not shown) drives with a fast rotational motion cylinder 1 by means of pulleys 5 and 6. Upon achieving rotation, the material to be ground enters the 3,162,383 Patented Dec. 22, 1964 "ice mill through bin 9, and traverses the duct formed by spindle or tube 8 and falls within the body of the mill through the window marked by arrow A.

Upon falling within the mill by gravity and by the centrifugal force, the material violently strikes the inner walls of cylinder 1 and rotates together therewith.

Said material violently strikes member 13 which is stationary and firmly held on tube or spindle 8. Upon impact against said member 13, the material is broken into pieces and therefore ground.

Upon fragmenting, the particles are attracted by the suction of extractor 10, going out through tube 11, which can have a variable height in order that the combined action of the extractor and the tube height will serve to classify the grain sizes.

Therefore, the above described mechanism is equivalent to a gravity air filter, inasmuch as the size of the granules leaving the mill can be regulated according to the height of the tube and the momentum of the efiluent.

It is to be noted that said mill works in a very different way as conventional mills, inasmuch as the centrifugal force makes the material to strike the inner walls and projects it against a fixed member which is the milling or grinding member proper.

In other conventional mills, if they rotate very fast, the balls and material to be ground should cling to the inner walls and grinding will not be effected. That is why the ball mills cannot rotate at a speed higher than 40 rpm. and the present mill, on the contrary, the faster it rotates, the better it grinds.

Among the principal advantages and characteristics of the present device, the following can be set forth:

(1) The throughout limit only depends on the strength of its parts and on the number of revolutions, the faster it rotates, the better it grinds.

(2) As the centrifugal force strongly fixes the material, the latter is very strongly drawn against the impact-receiving member.

(3) This is the only grinding mill wherein the grinding member is stationary, whereby it wears away very slowly.

(4) The dry suction system forces the ground material to go out very rapidly, classifying the sizes of the grains.

(5) Because of its special grinding system, it does not need charging.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

1. A grinding mill comprising an elongated hollow and substantially horizontally disposed spindle, a tubular casing surrounding said spindle and having end Walls forming an enclosure through which said spindle passes, said end walls having bearing means journaling said casing for rotation on said spindle, a grinding member within said casing and fixed to said spindle, said grinding member having an arcuate portion terminating in an edge spaced closely to the inner surface of said tubular casing, pulley means secured to said casing end walls and having V-shaped grooves for reception of belts for driving said casing at a high rate of rotation, hopper means connected to one end of said spindle for feeding material to be ground, an opening in the wall of said spindle within the casing for entry of material to be ground into the casing, and extractor means including a suction pump and a sectional discharge pipe connected to the other end of said spindle for sucking ground material from the casing, the sections of said discharge pipe including elbow sections and being slideably connected to permit variable tilting of said pipe to locate its discharge end at different levels for classifying the sizes of the discharged grains of ground material.

2. A grinding mill comprising an elongated hollow spindle, a tubular casing surrounding said spindle and said spindle passes, said end walls having bearing means journaling said casing for rotation on said spindle, a grinding member within said casing and fixed to said spindle, said grinding member having a portion terminating in an edge spaced closely to the inner surface of said tubular casing, drive means secured to said casing for driving said casing at a high rate of rotation, hopper means connected to one end of said spindle for feeding having end Walls forming an enclosure through which I material to be ground, an opening in the wall of said 10 discharge pipe,-the sections of said discharge pipe including elbow sections and being slideably connected to permit variable tilting of said pipe to locate its discharge end at different levels for classifying the sizes of the discharged grains of ground material.

References Cited in the file of this patent UNITED STATES PATENTS 252,361 Duc Jan. 17, 1882 1,954,613 Breeze Apr. 10, 1934 2,014,640 Wales Sept. 17, 1935 2,029,917 Frisch Feb. 4, 1936 2,148,529 Bucky Feb. 28, 1939 2,258,392 Piper Oct. 7, 1941 3,056,561 Hukki Oct. 2, 1962 FOREIGN PATENTS 690,842 Great Britain Apr. 29, 1953 1,057,419 Germany May 14, 1959 

1. A GRINDING MILL COMPRISING AN ELONGATED HOLLOW AND SUBSTANTIALLY HORIZONTALLY DISPOSED SPINDLE, A TUBULAR CASING SURROUNDING SAID SPINDLE AND HAVING END WALLS FORMING AN ENCLOSURE THROUGH WHICH SAID SPINDLE PASSES, SAID END WALLS HAVING BEARING MEANS JOURNALING SAID CASING FOR ROTATION ON SAID SPINDLE, A GRINDING MEMBER WITHIN SAID CASING AND FIXED TO SAID SPINDLE, SAID GRINDING MEMBER HAVING AN ARCUATE PORTION TERMINATING IN AN EDGE SPACED CLOSELY TO THE INNER SURFACE OF SAID TUBULAR CASING, PULLEY MEANS SECURED TO SAID CASING END WALLS AND HAVING V-SHAPED GROOVES FOR RECEPTION OF BELTS FOR DRIVING SAID CASING AT A HIGH RATE OF ROTATION, HOPPER MEANS CONNECTED TO ONE END OF SAID SPINDLE FOR FEEDING MATERIAL TO BE GROUND, AN OPENING IN THE WALL OF SAID SPINDLE WITHIN THE CASING FOR ENTRY OF MATERIAL TO BE GROUND INTO THE CASING, AND EXTRACTOR MEANS INCLUDING A SUCTION PUMP AND A SECTIONAL DISCHARGE PIPE CONNECTED TO THE OTHER END OF SAID SPINDLE FOR SUCKING GROUND MATERIAL FROM THE CASING, THE SECTIONS OF SAID DISCHARGE PIPE INCLUDING ELBOW SECTIONS AND BEING SLIDEABLY CONNECTED TO PERMIT VARIABLE TILTING OF SAID PIPE TO LOCATE ITS DISCHARGE END AT DIFFERENT LEVELS FOR CLASSIFYING THE SIZES OF THE DISCHARGED GRAINS OF GROUND MATERIAL. 